239251921 has 2 divisors, whose sum is σ = 239251922. Its totient is φ = 239251920.

The previous prime is 239251913. The next prime is 239251963. The reversal of 239251921 is 129152932.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213890625 + 25361296 = 14625^2 + 5036^2 .

It is a cyclic number.

It is not a de Polignac number, because 239251921 - 2³ = 239251913 is a prime.

It is not a weakly prime, because it can be changed into another prime (239251121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119625960 + 119625961.

It is an arithmetic number, because the mean of its divisors is an integer number (119625961).

Almost surely, 2^239251921 is an apocalyptic number.

It is an amenable number.

239251921 is a deficient number, since it is larger than the sum of its proper divisors (1).

239251921 is an equidigital number, since it uses as much as digits as its factorization.

239251921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 34.

The square root of 239251921 is about 15467.7703952444. The cubic root of 239251921 is about 620.8001471123.

The spelling of 239251921 in words is "two hundred thirty-nine million, two hundred fifty-one thousand, nine hundred twenty-one".